[Hitman]

The Rocky Mountain hubs and drums are one piece. The original style closed drums are two piece, with the drum and hub being separate, but secured together by swedging the wheel studs.

You should provide more clarity to your question.

I think you're asking if the original drum and hub configuration is the same as the Rocky Mountain style. If that's your question, yes, they are compatible and interchangeable as a drum and hub assembly.